13.1 Determine F12 and F21 for the following configurations using the reciprocity theorem and other basic shape fac- tor relations. Do not use tables or charts. (a) Long duct A2 (a) (b) Small sphere...

Extracted text: 13.1 Determine F12 and F21 for the following configurations using the reciprocity theorem and other basic shape fac- tor relations. Do not use tables or charts. (a) Long duct A2 (a) (b) Small sphere of area A, under a concentric hemi- sphere of area A, = 2A, Az (b) (c) Long duct. What is F22 for this case? A2 A (c) (d) Long inclined plates (point B is directly above the center of A,) В 100 mm A2 A +- 200 mm (d)